fix: performance

[alexander-akait]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• typo fix
• metadata update

Motivation / Use-Case

import perf

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Merging #1144 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1144   +/-   ##
=======================================
  Coverage   99.34%   99.34%           
=======================================
  Files          10       10           
  Lines         614      615    +1     
  Branches      190      190           
=======================================
+ Hits          610      611    +1     
  Misses          4        4           

Impacted Files	Coverage Δ
src/index.js	100.00% <ø> (ø)
src/plugins/postcss-import-parser.js	100.00% <100.00%> (ø)
src/plugins/postcss-url-parser.js	100.00% <100.00%> (ø)

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